From 3bc24a1a5441ef621daf737ec93b0a10e8999d59 Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Mon, 19 May 2008 13:40:12 +0900 Subject: [PATCH] sh: Initial ELF FDPIC support. This adds initial support for ELF FDPIC on MMU-less SH, as per version 0.2 of the ABI definition at: http://www.codesourcery.com/public/docs/sh-fdpic/sh-fdpic-abi.txt Signed-off-by: Paul Mundt --- arch/sh/kernel/ptrace_32.c | 23 +++++++++++++++++ arch/sh/kernel/signal_32.c | 25 ++++++++++++++++-- fs/Kconfig.binfmt | 2 +- include/asm-sh/elf.h | 53 +++++++++++++++++++++++++++++++++++++- include/asm-sh/mmu.h | 4 +++ include/asm-sh/ptrace.h | 5 ++++ 6 files changed, 108 insertions(+), 4 deletions(-) diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c index fddb547f3c2b..2bc72def5cf8 100644 --- a/arch/sh/kernel/ptrace_32.c +++ b/arch/sh/kernel/ptrace_32.c @@ -240,6 +240,29 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) } break; } +#endif +#ifdef CONFIG_BINFMT_ELF_FDPIC + case PTRACE_GETFDPIC: { + unsigned long tmp = 0; + + switch (addr) { + case PTRACE_GETFDPIC_EXEC: + tmp = child->mm->context.exec_fdpic_loadmap; + break; + case PTRACE_GETFDPIC_INTERP: + tmp = child->mm->context.interp_fdpic_loadmap; + break; + default: + break; + } + + ret = 0; + if (put_user(tmp, (unsigned long *) data)) { + ret = -EFAULT; + break; + } + break; + } #endif default: ret = ptrace_request(child, request, addr, data); diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c index f311551d9a05..46170a9a7221 100644 --- a/arch/sh/kernel/signal_32.c +++ b/arch/sh/kernel/signal_32.c @@ -33,6 +33,11 @@ #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) +struct fdpic_func_descriptor { + unsigned long text; + unsigned long GOT; +}; + /* * Atomically swap in the new signal mask, and wait for a signal. */ @@ -378,7 +383,15 @@ static int setup_frame(int sig, struct k_sigaction *ka, regs->regs[4] = signal; /* Arg for signal handler */ regs->regs[5] = 0; regs->regs[6] = (unsigned long) &frame->sc; - regs->pc = (unsigned long) ka->sa.sa_handler; + + if (current->personality & FDPIC_FUNCPTRS) { + struct fdpic_func_descriptor __user *funcptr = + (struct fdpic_func_descriptor __user *)ka->sa.sa_handler; + + __get_user(regs->pc, &funcptr->text); + __get_user(regs->regs[12], &funcptr->GOT); + } else + regs->pc = (unsigned long)ka->sa.sa_handler; set_fs(USER_DS); @@ -458,7 +471,15 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, regs->regs[4] = signal; /* Arg for signal handler */ regs->regs[5] = (unsigned long) &frame->info; regs->regs[6] = (unsigned long) &frame->uc; - regs->pc = (unsigned long) ka->sa.sa_handler; + + if (current->personality & FDPIC_FUNCPTRS) { + struct fdpic_func_descriptor __user *funcptr = + (struct fdpic_func_descriptor __user *)ka->sa.sa_handler; + + __get_user(regs->pc, &funcptr->text); + __get_user(regs->regs[12], &funcptr->GOT); + } else + regs->pc = (unsigned long)ka->sa.sa_handler; set_fs(USER_DS); diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt index 3263084eef9e..4a551af6f3fc 100644 --- a/fs/Kconfig.binfmt +++ b/fs/Kconfig.binfmt @@ -30,7 +30,7 @@ config COMPAT_BINFMT_ELF config BINFMT_ELF_FDPIC bool "Kernel support for FDPIC ELF binaries" default y - depends on (FRV || BLACKFIN) + depends on (FRV || BLACKFIN || (SUPERH32 && !MMU)) help ELF FDPIC binaries are based on ELF, but allow the individual load segments of a binary to be located in memory independently of each diff --git a/include/asm-sh/elf.h b/include/asm-sh/elf.h index 05092da1aa59..f01449a8d378 100644 --- a/include/asm-sh/elf.h +++ b/include/asm-sh/elf.h @@ -1,10 +1,15 @@ #ifndef __ASM_SH_ELF_H #define __ASM_SH_ELF_H +#include #include #include #include +/* ELF header e_flags defines */ +#define EF_SH_PIC 0x100 /* -fpic */ +#define EF_SH_FDPIC 0x8000 /* -mfdpic */ + /* SH (particularly SHcompact) relocation types */ #define R_SH_NONE 0 #define R_SH_DIR32 1 @@ -43,6 +48,28 @@ #define R_SH_RELATIVE 165 #define R_SH_GOTOFF 166 #define R_SH_GOTPC 167 + +/* FDPIC relocs */ +#define R_SH_GOT20 70 +#define R_SH_GOTOFF20 71 +#define R_SH_GOTFUNCDESC 72 +#define R_SH_GOTFUNCDESC20 73 +#define R_SH_GOTOFFFUNCDESC 74 +#define R_SH_GOTOFFFUNCDESC20 75 +#define R_SH_FUNCDESC 76 +#define R_SH_FUNCDESC_VALUE 77 + +#if 0 /* XXX - later .. */ +#define R_SH_GOT20 198 +#define R_SH_GOTOFF20 199 +#define R_SH_GOTFUNCDESC 200 +#define R_SH_GOTFUNCDESC20 201 +#define R_SH_GOTOFFFUNCDESC 202 +#define R_SH_GOTOFFFUNCDESC20 203 +#define R_SH_FUNCDESC 204 +#define R_SH_FUNCDESC_VALUE 205 +#endif + /* SHmedia relocs */ #define R_SH_IMM_LOW16 246 #define R_SH_IMM_LOW16_PCREL 247 @@ -77,9 +104,12 @@ typedef struct user_fpu_struct elf_fpregset_t; /* * This is used to ensure we don't load something for the wrong architecture. */ -#define elf_check_arch(x) ( (x)->e_machine == EM_SH ) +#define elf_check_arch(x) ((x)->e_machine == EM_SH) +#define elf_check_fdpic(x) ((x)->e_flags & EF_SH_FDPIC) +#define elf_check_const_displacement(x) ((x)->e_flags & EF_SH_PIC) #define USE_ELF_CORE_DUMP +#define ELF_FDPIC_CORE_EFLAGS EF_SH_FDPIC #define ELF_EXEC_PAGESIZE PAGE_SIZE /* This is the location that an ET_DYN program is loaded if exec'ed. Typical @@ -136,6 +166,27 @@ typedef struct user_fpu_struct elf_fpregset_t; _r->regs[8]=0; _r->regs[9]=0; _r->regs[10]=0; _r->regs[11]=0; \ _r->regs[12]=0; _r->regs[13]=0; _r->regs[14]=0; \ _r->sr = SR_FD; } while (0) + +#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, \ + _dynamic_addr) \ +do { \ + _r->regs[0] = 0; \ + _r->regs[1] = 0; \ + _r->regs[2] = 0; \ + _r->regs[3] = 0; \ + _r->regs[4] = 0; \ + _r->regs[5] = 0; \ + _r->regs[6] = 0; \ + _r->regs[7] = 0; \ + _r->regs[8] = _exec_map_addr; \ + _r->regs[9] = _interp_map_addr; \ + _r->regs[10] = _dynamic_addr; \ + _r->regs[11] = 0; \ + _r->regs[12] = 0; \ + _r->regs[13] = 0; \ + _r->regs[14] = 0; \ + _r->sr = SR_FD; \ +} while (0) #endif #define SET_PERSONALITY(ex, ibcs2) set_personality(PER_LINUX_32BIT) diff --git a/include/asm-sh/mmu.h b/include/asm-sh/mmu.h index eb0358c097d0..fdcb93bc6d11 100644 --- a/include/asm-sh/mmu.h +++ b/include/asm-sh/mmu.h @@ -12,6 +12,10 @@ typedef struct { struct vm_list_struct *vmlist; unsigned long end_brk; #endif +#ifdef CONFIG_BINFMT_ELF_FDPIC + unsigned long exec_fdpic_loadmap; + unsigned long interp_fdpic_loadmap; +#endif } mm_context_t; /* diff --git a/include/asm-sh/ptrace.h b/include/asm-sh/ptrace.h index 7d36dc3bee69..643ab5a7cf3b 100644 --- a/include/asm-sh/ptrace.h +++ b/include/asm-sh/ptrace.h @@ -87,6 +87,11 @@ struct pt_dspregs { unsigned long mod; }; +#define PTRACE_GETFDPIC 31 /* get the ELF fdpic loadmap address */ + +#define PTRACE_GETFDPIC_EXEC 0 /* [addr] request the executable loadmap */ +#define PTRACE_GETFDPIC_INTERP 1 /* [addr] request the interpreter loadmap */ + #define PTRACE_GETDSPREGS 55 #define PTRACE_SETDSPREGS 56 #endif -- 2.20.1